I would like to share my experience as a soft skill trainer. I am working for 11.yrs now with 8.yrs as Trainer. Now how I become trainer without certification.
1) Virtue of Interest and passion for teaching
2) Knowledge on varied subject
3) Open to share the topics with everyone
4) Love to mentor people
You can still do a lot of course as they were not so widely spoken in the market when I started. You can introspect your strength and see where your road lies ahead for you, is it in Soft skill field or behavioural skill or Management skill etc.
You can choose to do TTT (trainer the trainer) program to understand the nuances of training like, preparation of content, presentation, body language, handouts etc to start with and after a year of experience you'll have wonderful idea about what you really want to do.
1) As I said passion and interest are must for being a trainer. Although teaching and training is different, still I feel more than being a trainer, the self-thought of being a mentor will add more value and upkeep your passion for long time.
2) You need to updated yourself with lot of topics from past, present, riddles, comics, incidents and at times you need to know to mix up virtual with real incidents.
3) Training require some of the very important skill which will be taught in TTT program, still you can do lot of practice back at home.
A)You need to know how to prepare a ppt, trainer's manual, worksheets, participant manual, activites and games.
B)You should work on your tone, expression, modulation, speech volume, pitch and pronunciation.
c)You should be vary of your body language, movement on the floor, connect of your eyes with the participants.
D)You need to start in a nice note and end the training in a high spirited note and thus thrusting the confidence level in participant.
E)Very important, you need to know how to answer the questions asked to you and how to say no for something which you really don't know. YOu need to be honest and accept things diplomatically.
I would suggest you to join as Executive-Trainer and learn the nitty gritty of training while doing TTT.
Best of luck.
REgards